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Finding the Fourth Proportional to 106.77, 147.40 and 69.98

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Solution

The fourth proportional to 106.77, 147.40 and 69.98 is: 96.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.77 : 147.40 = 69.98 : x
  2. Step 2: Convert to fraction form
    106.77/147.40 = 69.98/x
  3. Step 3: Cross multiply
    106.77x = 147.40 × 69.98
  4. Step 4: Simplify right side
    106.77x = 10,314.33
  5. Step 5: Solve for x
    x = 10,314.33/106.77
  6. Step 6: Final answer
    x = 96.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.